Roll for india-rubber mixing and calendering machines



. (No Model) B. WEN 85 B. P. BRAGG. I ROLL FOR INDIA ER MIXING AND OALENDERING MACHINES.

Patented Nov. .7, 1893.

heavvons. 056,7 2 (fowew w\ 0 H m Qfi R ill ii! h RR? 1% p? UNITED STATES PATENT OFFICE.

ROBERT COWEN AND EDWARD F. BRAGG, OF CAMBRIDGE, MASSACHUSETTS, ASSIGNORS, BY DIRECT AND MESNE ASSIGNMENTS, TO THE AUTOMATIC RUBBER MIXER COMPANY, OF KENNEBUNK, MAINE.

ROLL FOR INDIA-RUBBER MIXINGAND CALENDERING MACHINES.

SPECIFICATION forming part of Letters PatentNo. 508,286, dated November 7, 1893.

I Application filed October 29, 1892. Berial No.450,311. (No model.)

To all whom it may concern:

Be it known that we, ROBERT OoWEN and EPWARD F. BRAGG, of Cambridge, county of Mlddlesex, State of Massachusetts, have invented an Improvement in Rolls for India- Rubber Mixing and Oalendering Machines,

&c., of which the following description, in con-' neetion with the accompanying drawings, is a specification, like letters on the drawings to representinglike parts.

In the mixing of india-rubber compounds, andin the subsequent steps of calendering materials containing india-rubber compounds, and in other classes of calender-ing machines, great difliculty is experienced because of undue heating of the roll attributable to friction. The rolls used for instance in the machines for mixing india-rubber compounds are now run at a very slow speed, usually from eleven to fifteen revolutions per minute, and such rolls are cooled by a stream of water which 1s permitted to flow continuously, usually through a pipe at the center of rotation of the roll, and then to return to the same end of the roll about the said pipe, the water on its return flow contacting for the first time with the body of the roll. These rolls are usually from fourteen to sixteen inches in diameter, and the diameter of the central opening is usually about two and three-fourths inches, thus leaving a large body of metal, which is acted upon ata very considerable distance from its outer surface. Thewater employed to cool theserolls is usually taken from a tank 5 and its temperature varies according to the weather so that in some weather it is almost impossible torun the machine for any length of time without overheating and thus injuring the stock, or else the machine is so run as 40 to produce less work and consequent heat.

It is no infrequent occurrence to have to stop a machine of the class referred to for hours to let the rolls cool.

In our experiments to enable this class of 5 machines to be run at faster speed, and yet not overheat the rolls, we have devised a roll in which the cold water entering it comes against the metal of the roll quite close to its periphery where the heat is generated, and

the water acts directlyagainst the solid metal of the roll in bothdirections of its flow, and

1. Fig. 3, is a section looking to the right of the line a, Fig. 1.

Fig. 4, is a section looking to the left'of the line m Fig. 1. Fig. 5, is a section through the journal of the roll in the line 00 but with the collar removed showing the end of the body of the roll in elevation; and Figs. 6 and 7, are opposite end views of the full roll shown in Fig. 1. p

The roll herein to be described consists essentially of a body A havingsuitable journals a, a, the ends of the journals being represented as having key seats in order that suitable beyel gearing may be applied thereto, as in practice the roll referred to will be geared intrain'with other like rolls between which the material being acted upon is made to pass, and it is the frictionbetween the rolls and the material being acted upon which produces the objectionable heat in the rolls which itis the object of this invention to overcome, undue heat in the roll injuriously afiecting the stock. e

The roll is provided with a central opening I) from end to end, and said opening is subsequently closed near one end of the roll by a suitable dam, as b.

The body A of the roll isprovided quite 8 close to its surface with a series of ports a running, as shown, from one to the other end of the roll. These ports, preferably substantially parallel each to the other, may be made in avariety of ways, the cheaper method known to us being the placing of a series of thin metal pipes in the mold in which is poured the metal to form the body of the roll, said pipes being thereby incorporated with and soas to form a solid portion ofthe 5 roll, the pipes and the molten metal during the casting operation being virtually welded. together so as to leave unobstructed ports 0 through the roll corresponding with the interior bores of the pipes. We have in this em- 10c bodiment of our invention arranged the ports so as to work in groups of two.

Upon a reduced portion of the roll near the journal a, we have placed a collar (1 having, see Fig. 2, a series of ports d, said collar being confined to the ends of the roll by aseries of screws or equivalents (1*, see Fig. 6, the said ports each being in communication with the ends of two of the ports 0. Going now to the journal a, a reduced portion of the roll near that journal is provided,see Figs. 1 and 3, with a series of radial ports e which communicate with the central passage 12 in the roll, and at opposite sides of the dam b, the said reduced end of the roll is provided with a series of ports f, see Fig. at.

Outside the reduced portion of the roll having the ports e and f, we have mounted acolla'r g provided with two annular ports or grooves at its inner side, as g, g said annular ports being in communication respectively with the ports f and e.

VlTith the parts described, the water entering the roll in the direction of the arrow Fig. 1,will travel through the center of the roll, and meeting the dam, will pass outwardly through the ports e into the annular port 9 from which it will be led by a suitable opening'e into one of the ports c, thence across to the opposite end of the roll near the periphery thereof and into the port d of the collar d, thence back through a substantially parallel port 0, said second port a, being in communication by a passage g see Fig. 4, with the annular port g and thence through the port f into the space at the center of the away to a suitable drain pipe or wherever the water may be discharged. The'collar gis atsee Fig. 7.

It will be noticed in the roll described that the water is passed through the body of the roll not only at its center but also very near where the cool water has the greatest opportunity to reduce the heat of the rolls.

A roll having ports as described, for the passage of water in order that the roll maybe quickly cooled is valuable for many different classes of machines.

Prior to this invention we are not aware that a roll has ever had a series of ports near its periphery through which water to cool the roll has free circulation, said ports in the form in which our invention is herein illustrated having combined with them collars having other ports, as described, so that the flow of the water may be substantially unobstructed.

Instead of employing the collar d, each pair of pipes to form the peripheral ports 0 may be connected together at one end by U-shaped elbows such as used for steam pipe work and the pipes so connected be put in the mold and be covered by molten metal.

This invention is not limited to the exact construction or direction of the ports, or to outlet end of its return port. 1 uniform temperature" of the entire surface of the roll is a mean temperature between the hottest and coldestwater' in the adjacent peripheral ports.

journal at the other side of the dam b, and

the exact shape of the ports in the collars referred to, so long as the water has free run through and out of the roll.

It will be noticed that the roll A 15 an mperforate roll, and that it presents a thlck strong body of metal which stores up the heat generated by friction of the roll on the material operated upon by it. It will also be seen that the Water may run several times from end to end of the roll.

Where rolls are employed in the manufacture and rolling of rubber, it has been found that the rubber always creeps toward the hottest parts of the rolls, and so sensitive is the rubber to these diflerences in temperature that a difference in temperature which islmperceptible to the touch may be detected by the tendency of the rubber to creep towarda particular part or parts of the rolls. In the rolls herein shown,however, it will be noticed that the peripheral ports are connected in pairs or sets. The coldest water from the axial passage, for example, entering one of theperipheral ports at one end flows through said port to the opposite end of the roll and back through its connected or return port to the end of the roll from which it started. By this arrangement a uniform temperature 1s maintained, the coldest water at the entrance end of one peripheral port being balanced or ofiset by the warmest water beside it at the Therefore, the

Having described our invention, what we 3 claim as new, and desire to secure by Letters Patent, is tached to' the roll by a series of screws as g,

1. A metal roll navinga series of peripheral .ports; a central passage,- and lateralports; a dam in said central passage; a series; of ports at one end of the roll corntnunrcating f with the peripheral ports, and a collar at the its periphery where the roll is the hottest and other end of the roll and communicating with not only the peripheral ports outwith the lateral ports at opposite sides of said dam-ermstantially as described.

2. An imperforate metal roll having a ceritral passage 12,- a series of longitudinal ports close to its imperforate p'eriphery,-and intermediate lateral ports between said central passage and said peripheral ports,and adam in the said central passage whereby water introduced through the central passage at one end of the roll is caused to travel through the lateral ports and the peripheral p'ortsand leave through thesaid central passage at the opposite end of the roll to thereby cool the metal of the roll not only at its center but also near its periphery, substantially as described.

3. An imperforate metal roll having a central passage; a series of longitudinal ports close to its periphery and connected in sets at one end, a series of intermediate lateral ports at the opposite ends of said peripheral ports and the saidrcentral passage, and a dam adjacent to and,,beyond the. lateral ports wherebywater introduced at the center of the roll is made to travel through the said central passage to the lateral ports and thence out through and into the said peripheral ports toward the other end of the roll to thus cool the metal of the roll at not onlyits center but at its periphery, substantially as described.

4. An imperforate metal roll having both an axial inlet and outlet and longitudinal peripheral ports connecting the same and to conduct fluid from the inlet to theoutletpthe flow of fluidthrough'alteriiate portsjbeing in opposite directions whereby a mean temperature is obtained, substantially as described.

5. An imperforate'metal roll having two seriesof peripheral ports through which fluid 1 "is circulatedthe direction of flow through 20 the portsofonesetbeing opposite the direction of flow through the ports. of the other 'or channels connecting the longitudinal peand outlet, subripheral ports with the inlet stantiallyi as described.

In testimony whereof we have signed our names to'this specification in'the presence of two subscribing witnesses.

ROBERT cowEN.

EDWARD F. BRAGG.

Witnesses to R. 0.:

K. J. FENNO, J; O. DEJWOLF. Witnesses to E. F. 13,:

W, A. DARLING, K. J. FENMNO. 

